BUDDING OF HYDRA 



249 



I. Describe the shape, color, and size of yeast cells. 



A. Note and describe the large vacuole in each cell. 



B. Describe any other structures that you see. 



II. Notice tiny protuberances on some of the cells. These are called buds. 

 This process of reproducing is called budding. 



A. Compare the buds with the original cells as to size and appearance. 



B. Describe a difference between budding and binary fission. 



C. Compare the different buds in size. Account for the difference. 



D. Examine the field of the microscope carefully and see whether the 

 buds always cling to the original cell or whether they separate from it. 



E. If the original cell is called the mother cell and the bud is the 

 daughter cell, do you find any granddaughter cells? Explain how you 

 recognize them. 



F. There is a nucleus in the yeast cell although it may be difficult to see 

 it without staining. The nucleus divides mitotically in forming the bud. 



G. Draw : 1. Yeast cells ten times larger than seen under the micro- 

 scope. Label cytoplasm, vacuole, and cell wall. 2. Yeast cells budding. 

 Label cell and bud. 3. A group of yeast cells with successive buds. 



H. Compare your sketch with the diagram on page 248. 



parent 



Budding of hydra. Hydra, a small, many-celled animal, is often 

 seen growing on the side of an aquarium jar. Hydra has a mouth, 

 several armlike struc- 

 tures called tentacles, 

 a thick wall of out- 



side body cells, and a 

 delicate inner layer of 

 cells inclosing a body 

 cavity. The tentacles 

 wave about and cap- 

 ture food which they 

 convey to the mouth. 

 When hvdras are 

 mounted under the 

 microscope, one or more buds may be seen on the body walls. 

 Each bud is a new animal in some stage of development. 



WH. FITZ. AD. BIO. — 17 



The hydra often grows a bud and occasionally an animal is 

 found with a daughter bud bearing active tentacles. 



